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            使用 Lombok 减少 Java Bean 代码 | 
        
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                使用 Lombok 减少 Java Bean 代码
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        <blockquote>
<p>“这篇文章将介绍如何使用Lombok 来减少 Java Bean 的代码”</p>
</blockquote>
<h2 id="简介"><a href="#简介" class="headerlink" title="简介"></a>简介</h2><p>lombok 就是一款可以简化 get/set/toString/equals 等方法的工具!</p>
<ul>
<li><a href="https://projectlombok.org" target="_blank" rel="external">官网</a></li>
<li><a href="https://github.com/rzwitserloot/lombok" target="_blank" rel="external">GitHub</a></li>
</ul>
<h2 id="安装"><a href="#安装" class="headerlink" title="安装"></a>安装</h2><h3 id="IDE安装"><a href="#IDE安装" class="headerlink" title="IDE安装"></a>IDE安装</h3><ul>
<li>IDEA<br><img src="http://on2bs9q7q.bkt.clouddn.com/20170416149232607786005.png" alt="20170416149232607786005.png"></li>
</ul>
<p>设置<br><img src="http://on2bs9q7q.bkt.clouddn.com/20170418149248619455974.png" alt="20170418149248619455974.png"></p>
<p><strong>Enable annotation processing</strong>勾选</p>
<ul>
<li><p>eclipse / myeclipse 手动安装 lombok (没试过)</p>
<ul>
<li><p>将 lombok.jar 复制到 myeclipse.ini / eclipse.ini 所在的文件夹目录下</p>
</li>
<li><p>打开 eclipse.ini / myeclipse.ini，在最后面插入以下两行并保存：</p>
<ul>
<li>-Xbootclasspath/a:lombok.jar</li>
<li>-javaagent:lombok.jar</li>
</ul>
</li>
<li><p>重启 eclipse / myeclipse</p>
</li>
</ul>
</li>
</ul>
<h3 id="添加依赖"><a href="#添加依赖" class="headerlink" title="添加依赖"></a>添加依赖</h3><ul>
<li><p>Maven 地址</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div></pre></td><td class="code"><pre><div class="line"><span class="tag">&lt;<span class="name">dependencies</span>&gt;</span></div><div class="line">	<span class="tag">&lt;<span class="name">dependency</span>&gt;</span></div><div class="line">		<span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.projectlombok<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></div><div class="line">		<span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>lombok<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></div><div class="line">		<span class="tag">&lt;<span class="name">version</span>&gt;</span>1.16.16<span class="tag">&lt;/<span class="name">version</span>&gt;</span></div><div class="line">		<span class="tag">&lt;<span class="name">scope</span>&gt;</span>provided<span class="tag">&lt;/<span class="name">scope</span>&gt;</span></div><div class="line">	<span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></div><div class="line"><span class="tag">&lt;/<span class="name">dependencies</span>&gt;</span></div></pre></td></tr></table></figure>
</li>
<li><p>Gradle 地址</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">provided "org.projectlombok:lombok:1.16.16"</div></pre></td></tr></table></figure>
</li>
<li><p><a href="https://projectlombok.org/downloads/lombok.jar" target="_blank" rel="external">jar 下载</a>手动添加</p>
</li>
</ul>
<h2 id="使用"><a href="#使用" class="headerlink" title="使用"></a>使用</h2><h3 id="快速入门"><a href="#快速入门" class="headerlink" title="快速入门"></a>快速入门</h3><p><img src="http://on2bs9q7q.bkt.clouddn.com/2017041614923263831722.png" alt="2017041614923263831722.png"></p>
<p>直接类上加<code>@Data</code>注解 自动生成 getXxx()/setXxx()/toString()/equals(Object)等方法</p>
<h3 id="注解说明"><a href="#注解说明" class="headerlink" title="注解说明"></a>注解说明</h3><h4 id="NonNull"><a href="#NonNull" class="headerlink" title="@NonNull"></a>@NonNull</h4><p>如果被注解属值为 <code>null</code> 将抛出 <code>NullPointerException</code></p>
<p>可以修饰的对象为: FIELD(域),METHOD(方法),PARAMETER(参数),LOCAL_VARIABLE(局部变量)</p>
<h4 id="Cleanup"><a href="#Cleanup" class="headerlink" title="@Cleanup"></a>@Cleanup</h4><p>修饰 Java IO 类，会自动对资源调用close()方法关闭.</p>
<p>可以修饰的对象为: LOCAL_VARIABLE(局部变量)</p>
<h4 id="Getter-Setter"><a href="#Getter-Setter" class="headerlink" title="@Getter / @Setter"></a>@Getter / @Setter</h4><p>自动生成 <code>getXxx()</code>/<code>setXxx()</code></p>
<h5 id="Getter-lazy-true"><a href="#Getter-lazy-true" class="headerlink" title="@Getter(lazy=true)"></a>@Getter(lazy=true)</h5><p>当需要使用<code>get</code>获取的值需要非常大资源计算 可以创建一个<code>private final 变量</code>使用<code>@Getter(lazy=true)</code>修饰 用这次计算的值对其进行赋值。</p>
<p>可以修饰的对象为: LOCAL_VARIABLE(局部变量)，TYPE(类、接口(包括注解类型)、enum)</p>
<h4 id="ToString"><a href="#ToString" class="headerlink" title="@ToString"></a>@ToString</h4><p>自动生成 <code>toString()</code></p>
<p>可以修饰的对象为: TYPE(类、接口(包括注解类型)、enum)</p>
<h4 id="EqualsAndHashCode"><a href="#EqualsAndHashCode" class="headerlink" title="@EqualsAndHashCode"></a>@EqualsAndHashCode</h4><p>自动生成 <code>equals()</code> 和 <code>hashCode()</code> 方法</p>
<p>可以修饰的对象为: TYPE(类、接口(包括注解类型)、enum)</p>
<h4 id="NoArgsConstructor、-RequiredArgsConstructor、-AllArgsConstructor"><a href="#NoArgsConstructor、-RequiredArgsConstructor、-AllArgsConstructor" class="headerlink" title="@NoArgsConstructor、@RequiredArgsConstructor、@AllArgsConstructor"></a>@NoArgsConstructor、@RequiredArgsConstructor、@AllArgsConstructor</h4><p>自动生成 构造无参方法、构造非<code>final</code>或<code>@NonNull</code>修饰对象的有参构造方法、构造全部参数构造方法</p>
<p>可以修饰的对象为: TYPE(类、接口(包括注解类型)、enum)</p>
<h4 id="Data"><a href="#Data" class="headerlink" title="@Data"></a>@Data</h4><p>组合注解相当于:<code>@ToString</code>、<code>@EqualsAndHashCode</code>、<code>@Getter(全部)</code>、<code>@Setter(非final字段)</code>、<code>@RequiredArgsConstructor</code></p>
<p>可以修饰的对象为: TYPE(类、接口(包括注解类型)、enum)</p>
<h4 id="Value"><a href="#Value" class="headerlink" title="@Value"></a>@Value</h4><p>被修饰的会加<code>final</code>、<code>@ToString</code>、<code>@EqualsAndHashCode</code>、<code>@AllArgsConstructor</code>、<code>@FieldDefaults(makeFinal = true, level = AccessLevel.PRIVATE)</code>、<code>@Getter</code></p>
<p>可以修饰的对象为: TYPE(类、接口(包括注解类型)、enum)</p>
<h4 id="Builder"><a href="#Builder" class="headerlink" title="@Builder"></a>@Builder</h4><p>生成一个内部类<code>BuilderExampleBuilder</code>可以使用链式编程创建对象。</p>
<p>如:Person.builder().name(“Binux”).city(“NanJing.”).build();</p>
<p>可以修饰的对象为: TYPE(类、接口(包括注解类型)、enum),CONSTRUCTOR(构造器),METHOD(方法)</p>
<h4 id="SneakyThrows"><a href="#SneakyThrows" class="headerlink" title="@SneakyThrows"></a>@SneakyThrows</h4><p>对修饰对象进行<code>try-catch</code> value为<code>Throwable&gt;[] value()</code> 可以声明异常类型</p>
<p>可以修饰的对象为: CONSTRUCTOR(构造器),METHOD(方法)</p>
<h4 id="Synchronized"><a href="#Synchronized" class="headerlink" title="@Synchronized"></a>@Synchronized</h4><p>对修饰方法内进行加锁 <code>value</code>值为锁名称 锁为<code>Object</code>类型 </p>
<p>如:<code>private final Object $lock = new Object[0];</code></p>
<p>可以修饰的对象为: METHOD(方法)</p>
<h4 id="Log"><a href="#Log" class="headerlink" title="@Log"></a>@Log</h4><p>当需要使用<code>get</code>获取的值需要非常大资源计算 可以创建一个<code>private final 变量</code> 用这次计算的值对其进行赋值。</p>
<ul>
<li><p>@CommonsLog</p>
<p>  <code>Creates private static final org.apache.commons.logging.Log log = org.apache.commons.logging.LogFactory.getLog(LogExample.class);</code></p>
</li>
<li><p>@JBossLog</p>
<p>  <code>Creates private static final org.jboss.logging.Logger log = org.jboss.logging.Logger.getLogger(LogExample.class);</code></p>
</li>
<li><p>@Log</p>
<p>  <code>Creates private static final java.util.logging.Logger log = java.util.logging.Logger.getLogger(LogExample.class.getName());</code></p>
</li>
<li><p>@Log4j</p>
<p>  <code>Creates private static final org.apache.log4j.Logger log = org.apache.log4j.Logger.getLogger(LogExample.class);</code></p>
</li>
<li><p>@Log4j2</p>
<p>  <code>Creates private static final org.apache.logging.log4j.Logger log = org.apache.logging.log4j.LogManager.getLogger(LogExample.class);</code></p>
</li>
<li><p>@Slf4j</p>
<p>  <code>Creates private static final org.slf4j.Logger log = org.slf4j.LoggerFactory.getLogger(LogExample.class);</code></p>
</li>
<li><p>@XSlf4j</p>
<p>  <code>Creates private static final org.slf4j.ext.XLogger log = org.slf4j.ext.XLoggerFactory.getXLogger(LogExample.class);</code></p>
</li>
</ul>
<p>可以修饰的对象为: TYPE(类、接口(包括注解类型)</p>
<h2 id="详情请查看"><a href="#详情请查看" class="headerlink" title="详情请查看"></a>详情请查看</h2><p><a href="https://projectlombok.org/features/index.html" target="_blank" rel="external">https://projectlombok.org/features/index.html</a></p>
<hr>
<h2 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h2><p>lombok 解决了成员类型修改后 还需重新生成getXxx/setXxx()/toString()等方法的问题，还是很实用的。</p>
<hr>
<h2 id="著作权声明"><a href="#著作权声明" class="headerlink" title="著作权声明"></a>著作权声明</h2><p>本文首次发布于 <a href="http://binux.cn">Binux Blog</a>，转载请保留以上链接</p>

    

    
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